Driving head for lathes



' March 19, 1940. J N |NGALSBE 2,194,391

DRIVING HEAD FOR LATHES Filed March 8, 1939 2 Sheets-Sheet l Inventor 5Z4852 fNGALSBf,

n g mwmz A iiorneys Man]! 19, 1940- J. N. INGALSBE I 2,194,391

DRIVING HEAD FOR LATHES 2 Sheets-Sheet 2 Inventor JABE /V. [/VGA 4 6 BE,

mgvmmm A iiorneys Patented Mar. 19, 1940 UN E {ST T S P A ET] OFF EApplication My invention relates. to improvements in lathes, and moreparticularlyto driving heads therefor. l

The invention is designed with the'principal object in View of providinga rotary driving head adapted for incorporation in the head stock .ofstandard lathes and release the work without stopping operation of thehead or slowing down the speed of the same.

To the accomplishment-of the above, and subordinate objects presentlyappearing, a preferred embodiment of my invention has been illustratedin the accompanying drawings, set forth in detail in the succeedingdescription, and defined in the claim appended hereto. 1

In said drawings:

Figure l is a fragmentary View in'front elevation illustrating myimproved driving head at-' tached to the head stock of a standard typelathe. Figure 2 is a'view in side elevation of the driv ing head andassociated parts detached and drawn to an enlarged scale. I

Figure 3 is a view in longitudinal section taken on line 3-3 of Figure4;

and

Figure 5 ,is a view in transverse section, taken on the line 5-5 ofFigure 2 looking in the direction indicated by the arrows.

Referring to the drawings by numerals, the driving head I of myinvention comprises a cylindrical internally threaded socket part 2adapted to be screwed tight onto the usual reduced, threaded leading end3 of the live mandrel 4 of the head stock 5, said socket part having ashort axial sleeve 6 extending therefrom toward the tail stock, notshown, of the lathe and terminating in a circular, concentric, radialflange 1. Wrench apertures, as at 8, for a spanner wrench are providedin the socket part 2 to facilitate turning said part on and off theleading end 3 of said mandrel 4. A plunger shaft?! is slidably fitted inthe sleeve '6 for endwise movement, said shaft having an enlarged rearend section extending rearwardly of said socket part as best shown inFigure 3. The lathe mandrel 4 is provided with an axial bore I l thereinextending inwardly from the leading end 3 thereof for a suitabledistance and in which the section 10 of the plunger shaft 9 is slidablyfitted for endwise movement therein. A tension spring 12 in the bore, Il, between the rear end of the bore and the section ill, urges saidplunger shaft 9 outwardly of the sleeve 6 and socket part 2 into anormal position established to' automatically grip and Figure 4 is aview in end elevation of the head,v

March 8, 1939, Serial No. 26b,c1v- 1 Claim. (01. err-40) byengagement ofthe front end of the section ill with the front end of the socket part.

The leading,or front, end of the plunger shaft 9 terminates in adisc-like head and which in the normal position of said plunger shaft 9is spaced forwardly of the flange E. tering stud l4 extends forwardlyfrom the flange I in the axis-thereof. members l5 extend rearwardly fromsaid flange [3 parallel with the plunger shaft 9. and upon diametricallyopposite sides of said flange l3, said members being-slidable throughbores [6 provided in the flange l. l A plurality of pointed driving pinsll extend forwardly from the flange l in equidistantly spaced relationand parallel with the axis of the plunger spondingly spaced apertures l8provided in the flange 13, said pins being of a length such that theflange [3 in the normal position thereof is located forwardly of thepoints of said pins. 7 The heads of the key members l5 are designed toengage the rear face of the flange 1 and to thereby facilitateestablishing the normal position of said flange l3.

As will now be seen, the flange plunger shaft 9, is keyed to the flangeI so that the entire head structure described rotates with re lathemandrel l and the flange l3 together with said shaft 9 may be pushedrearwardly from normal position relative to the flange I in oppositionto the spring l2 to cause the driving pins H to project through theapertures Iii and forwardly of the latter.

Referring to the operation of the described driving head, the work, notshown, is positioned at one end against the usual center on the tail l3,likewise the A conical c'enshaft 9 and into correflange i3 similar tothe flange l, forming a false A pair of bolt-like key v stock, notshown, which center may be dead or the work'against said stud It aspressure is applied to said tail stock the flange [3, or false head, isforced back so that the driving pins l'l project forwardly thereof andgradually enter said other end of the work far enough to hold the workfirm .and impart rotation thereto. When it is desired to release thework, the tail stock is backed off, under which operation the plungershaft 9 and flange 13 or false head 'are thrust forwardly by the springI2 toward normal position, the stud M forcing the work off the pins I"!as will be clear. I

With the described driving head, the described holding and releasing ofthe work may be accomplished without stopping the drive (not shown) ofthe head stock or slowing the same down.

The foregoing will, it is believed, suflice to impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention as described, is susceptible of modificationwithout departing from the inventive concept and right is hereinreserved to all such modifications falling within the scope of thesubjoined claim, o

What I claim is: I

The combination with the head stock of a lathe, of a live mandrelrotatably mounted in said head stock and having an axial bore extendingpart-way thereinto, and a work driving head comprising a socket partd'etachably securedon said mandrel, a plunger shaft endwise slidable insaid bore and through said socket part inwardly and outwardly of thesame and having a circu- ,wardly of said socket lar radial flangethereon in front of said socket part provided with a circular seriesofapertures.

therein and movable by said shaft in'correspond- I ence therewith,reactive means in said bore opposing inward movement of said shaft andflange and normally urging said shaft and flange forpart into projectedposition,

a plurality of pointed driving pins extending from

